Add /health endpoint

[ashmckenzie]

This PR adds a new /health endpoint which for now, just displays the version and is designed to be used to determine API health and inform of the running version for diagnostic/informational purposes:

$ curl -qs http://127.0.0.1:4000/health | jq .
{
  "version": "v0.18-114-gb9384d5"
}

[ashmckenzie]

Am not sure if I did this correctly or missed adding any tests etc so would love to hear any feedback 🙂

cc @0xERR0R

[codecov[bot]]

Codecov Report

Merging #606 (b9384d5) into development (50ac5ce) will decrease coverage by 1.19%. The diff coverage is 80.00%.

@@               Coverage Diff               @@
##           development     #606      +/-   ##
===============================================
- Coverage        93.90%   92.70%   -1.20%     
===============================================
  Files               37       37              
  Lines             3263     3278      +15     
===============================================
- Hits              3064     3039      -25     
- Misses             134      173      +39     
- Partials            65       66       +1     

Impacted Files	Coverage Δ
resolver/blocking_resolver.go	97.61% <0.00%> (-0.88%)	:arrow_down:
api/api_endpoints.go	91.66% <100.00%> (+2.08%)	:arrow_up:
redis/redis.go	66.44% <0.00%> (-24.35%)	:arrow_down:

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[github-actions[bot]]

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[github-actions[bot]]

This PR was closed because it has been stalled for 10 days with no activity.